Economic gold mineralization at Amoanda project area is hosted mainly in the footwall quartzite
of the Banket series of the group. Igneous rocks generally are barren in both Amoanda project
area and Greater Damang project area. However, core logs and sections from extensive deep
drilling at Greater Damang has identified a deep-seated mineralized diorites body whereas
igneous intrusive rocks in Amoanda which is suspected to be having similar characteristics show
no gold mineralization so far. The question asked is whether the intrusives are the same for the
two different project areas and if so why one is mineralized and the other not.
Two methods were employed, namely petrography and geochemistry
Petrographically, two uniquely weak foliated and fractured igneous rocks, the Meta Diorite and
the Meta Dolerite. Major alteration minerals in the selected samples were the cubic pyrites
whereas that of the mineralized was euhedral. Geochemically, the average abundance of trace
elements such as As,Mn,Fe,Cu,Mg and Ag in selected igneous rocks which form pathfinders to
gold mineralisationin in the Birimian were below the background values of average elemental
abundance of As, Mn,Fe,Cu,Mg and Ag in normal igneous rocks. This suggests that the
intrusives in the Amoanda project area is unmineralised according to Green (1959).
Structurally, deformation is weak in the unmineralised igneous rocks where deformations in the
mineralized rocks are extensive. The extensive deformation of mineralized deep seated igneous
rocks may be as a result of the presence of a structural regime that ruptured and provided
enabling environments for the permeation, cooling and subsequent deposition of gold
mineralization from the ore bearing hydrothermal fluids.
CDR, C (2021). Petrography And Geochemistry Of Igneous Rocks In Amoanda Damang Mine And Iits Relationship With Gold. Afribary.com: Retrieved May 08, 2021, from https://afribary.com/works/petrography-and-geochemistry-of-igneous-rocks-in-amoanda-damang-mine-and-iits-relationship-with-gold
Coalition, CDR. "Petrography And Geochemistry Of Igneous Rocks In Amoanda Damang Mine And Iits Relationship With Gold" Afribary.com. Afribary.com, 07 Apr. 2021, https://afribary.com/works/petrography-and-geochemistry-of-igneous-rocks-in-amoanda-damang-mine-and-iits-relationship-with-gold . Accessed 08 May. 2021.
Coalition, CDR. "Petrography And Geochemistry Of Igneous Rocks In Amoanda Damang Mine And Iits Relationship With Gold". Afribary.com, Afribary.com, 07 Apr. 2021. Web. 08 May. 2021. < https://afribary.com/works/petrography-and-geochemistry-of-igneous-rocks-in-amoanda-damang-mine-and-iits-relationship-with-gold >.
Coalition, CDR. "Petrography And Geochemistry Of Igneous Rocks In Amoanda Damang Mine And Iits Relationship With Gold" Afribary.com (2021). Accessed May 08, 2021. https://afribary.com/works/petrography-and-geochemistry-of-igneous-rocks-in-amoanda-damang-mine-and-iits-relationship-with-gold